/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "src/gpu/ganesh/gl/GrGLAttachment.h"

#include "include/core/SkTraceMemoryDump.h"
#include "include/gpu/ganesh/gl/GrGLBackendSurface.h"
#include "src/gpu/ganesh/gl/GrGLGpu.h"

#define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X)

#define GL_ALLOC_CALL(call)                                  \
    [&] {                                                    \
        if (gpu->glCaps().skipErrorChecks()) {               \
            GR_GL_CALL(gpu->glInterface(), call);            \
            return static_cast<GrGLenum>(GR_GL_NO_ERROR);    \
        } else {                                             \
            gpu->clearErrorsAndCheckForOOM();                \
            GR_GL_CALL_NOERRCHECK(gpu->glInterface(), call); \
            return gpu->getErrorAndCheckForOOM();            \
        }                                                    \
    }()

static bool renderbuffer_storage_msaa(GrGLGpu *gpu, int sampleCount, GrGLenum format, int width, int height)
{
    SkASSERT(GrGLCaps::kNone_MSFBOType != gpu->glCaps().msFBOType());
    GrGLenum error;
    switch (gpu->glCaps().msFBOType()) {
        case GrGLCaps::kStandard_MSFBOType:
            error =
                GL_ALLOC_CALL(RenderbufferStorageMultisample(GR_GL_RENDERBUFFER, sampleCount, format, width, height));
            break;
        case GrGLCaps::kES_Apple_MSFBOType:
            error = GL_ALLOC_CALL(
                RenderbufferStorageMultisampleES2APPLE(GR_GL_RENDERBUFFER, sampleCount, format, width, height));
            break;
        case GrGLCaps::kES_EXT_MsToTexture_MSFBOType:
        case GrGLCaps::kES_IMG_MsToTexture_MSFBOType:
            error = GL_ALLOC_CALL(
                RenderbufferStorageMultisampleES2EXT(GR_GL_RENDERBUFFER, sampleCount, format, width, height));
            break;
        case GrGLCaps::kNone_MSFBOType:
            SkUNREACHABLE;
    }
    return error == GR_GL_NO_ERROR;
}

sk_sp<GrGLAttachment> GrGLAttachment::MakeStencil(GrGLGpu *gpu, SkISize dimensions, int sampleCnt, GrGLFormat format)
{
    GrGLuint rbID = 0;

    GL_CALL(GenRenderbuffers(1, &rbID));
    if (!rbID) {
        return nullptr;
    }
    GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, rbID));
    GrGLenum glFmt = GrGLFormatToEnum(format);
    // we do this "if" so that we don't call the multisample
    // version on a GL that doesn't have an MSAA extension.
    if (sampleCnt > 1) {
        if (!renderbuffer_storage_msaa(gpu, sampleCnt, glFmt, dimensions.width(), dimensions.height())) {
            GL_CALL(DeleteRenderbuffers(1, &rbID));
            return nullptr;
        }
    } else {
        GrGLenum error =
            GL_ALLOC_CALL(RenderbufferStorage(GR_GL_RENDERBUFFER, glFmt, dimensions.width(), dimensions.height()));
        if (error != GR_GL_NO_ERROR) {
            GL_CALL(DeleteRenderbuffers(1, &rbID));
            return nullptr;
        }
    }

    return sk_sp<GrGLAttachment>(new GrGLAttachment(gpu, rbID, dimensions, GrAttachment::UsageFlags::kStencilAttachment,
        sampleCnt, format,
        /* label= */ "GLAttachmentMakeStencil"));
}

sk_sp<GrGLAttachment> GrGLAttachment::MakeMSAA(GrGLGpu *gpu, SkISize dimensions, int sampleCnt, GrGLFormat format)
{
    GrGLuint rbID = 0;

    GL_CALL(GenRenderbuffers(1, &rbID));
    if (!rbID) {
        return nullptr;
    }
    GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, rbID));
    GrGLenum glFmt = gpu->glCaps().getRenderbufferInternalFormat(format);
    if (!renderbuffer_storage_msaa(gpu, sampleCnt, glFmt, dimensions.width(), dimensions.height())) {
        GL_CALL(DeleteRenderbuffers(1, &rbID));
        return nullptr;
    }

    return sk_sp<GrGLAttachment>(new GrGLAttachment(gpu, rbID, dimensions, GrAttachment::UsageFlags::kColorAttachment,
        sampleCnt, format,
        /* label= */ "GLAttachmentMakeMSAA"));
}


void GrGLAttachment::onRelease()
{
    if (0 != fRenderbufferID) {
        GrGLGpu *gpuGL = (GrGLGpu *)this->getGpu();
        const GrGLInterface *gl = gpuGL->glInterface();
        GR_GL_CALL(gl, DeleteRenderbuffers(1, &fRenderbufferID));
        fRenderbufferID = 0;
    }

    INHERITED::onRelease();
}

void GrGLAttachment::onAbandon()
{
    fRenderbufferID = 0;

    INHERITED::onAbandon();
}

GrBackendFormat GrGLAttachment::backendFormat() const
{
    return GrBackendFormats::MakeGL(GrGLFormatToEnum(fFormat), GR_GL_TEXTURE_NONE);
}

void GrGLAttachment::setMemoryBacking(SkTraceMemoryDump *traceMemoryDump, const SkString &dumpName) const
{
    SkString renderbuffer_id;
    renderbuffer_id.appendU32(this->renderbufferID());
    traceMemoryDump->setMemoryBacking(dumpName.c_str(), "gl_renderbuffer", renderbuffer_id.c_str());
}

void GrGLAttachment::onSetLabel()
{
    SkASSERT(fRenderbufferID);
    if (!this->getLabel().empty()) {
        const std::string label = "_Skia_" + this->getLabel();
        GrGLGpu *glGpu = static_cast<GrGLGpu *>(this->getGpu());
        if (glGpu->glCaps().debugSupport()) {
            GR_GL_CALL(glGpu->glInterface(), ObjectLabel(GR_GL_TEXTURE, fRenderbufferID, -1, label.c_str()));
        }
    }
}
